Today I realized: Detritus has a subtle sense of humor that shows up earlier than when Vimes notices it. Vimes only sees it when Detritus, having conscripted Coalface into the Watch, says that "Carrot says there's some good buried somewhere in everyone," and says his job is "Engineer in charge of deep mining operations." He says that his ability to joke is due to the cooling helmet that Cuddy made for him. Earlier, when Detritus and Cuddy are digging upward from the cool tunnels into the UU library, the Librarian hears Detritus singing "Dlog, glod, dlog, glod" and then when he switches to "Gold, gold, gold gold" Cuddy shouts "Now you're singing the chorus!"
It seems that Detritus is being thick. But earlier, when he was sworn in, we learned that Detritus has an excellent memory even when not in a cool place; he recited the oath perfectly after hearing it once, despite the potential distraction of people around him talking about other things. It is unlikely that he would have gotten the song wrong.
I think Detritus is gently teasing Cuddy during the long digging out.
We see more of Detritus's sense of humor in Jingo.
It seems that Detritus is being thick. But earlier, when he was sworn in, we learned that Detritus has an excellent memory even when not in a cool place; he recited the oath perfectly after hearing it once, despite the potential distraction of people around him talking about other things. It is unlikely that he would have gotten the song wrong.
I think Detritus is gently teasing Cuddy during the long digging out.
We see more of Detritus's sense of humor in Jingo.